Well-seal



P. H. MACK.

WELL SEAL.

APPLICATLON FILED NOV. 28, |919.

Patented Nov: `1, 1921.

ffq'gd.

UNITED STATES PATENT OFFICE.

PATRIQK MACK, `or BRADEORE, PENNSYLVANIA, AssIGNoR To oIL WELL SUPPLY COMPANY, oEPITTsBURGH, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

WELL-SEAL.

Specification of Letters Patent. Patented NOV. 1, 1921.

Application led November 28, 1919. Serial No. 341,176.

To @ZZ whom t may concern.

Be it known that I, PATRICK H. MACK, a citizen of the United States, residing at Bradford, in the county of McKean andY State of Pennsylvania, have invented certain new and useful Improvements in Well- Seals, of which the following is a specification. 1

The prime object of the present invention is to provide a simple, cheap and eflicient seal or packer for oil and similar wells.l and particularly a structure of the character described especially adapted for use in comparatively shallow wells or in cases where it is unnecessary to employ an expensive packing structure.

In the accompanying drawings which illustrate au application of my invention,

Figure l is alongitudinal sectional view of the seal or packer shown applied to a portion of a casing section;

Fig. 2, a'horizontal sectional view, the sec-4 tion being taken on line II--II of Fig. l;

Fig. 3, a View similar to Fig. l showing a modified construction; and

Fig. 4, a sectional view of the form of Fig. 3, the section being taken onk line IV-IV of Fig. 3.

As illustrated and as preferred, the seal or packer constituting the present invention is designed to be lowered into the well and set by the string of casing. In the drawings, l designates the lower section of a string of casing. This lower section in the form of Fig. 1 is provided at its lower end with an externally threaded slightly tapered portion or extension 2.

The seal or packer of the form of Fig. I

includes a hollow body or coupling member 3 having a central bore 4, an internally threaded, slightly tapering portion 5, a shoulder 6, and an externally threaded reduced portion or extension 7. The seal or packer structure is directly connected with lower casing section l by means of the cooperating threaded portions of the said section and seal.

Disposed upon the threaded extension 7 is an annular packing element 9. Packing element 9 may be made of rubber or other suitable compressible and expansible material, and is preferably of the form shown. As illustrated, it includes an upper portion a, ofless thickness than the lower portion b, an annular shoulder o, the latter being adapted to make contact with the lower end of extension 7, and a tapering inner wall, face or surface d. The internal diameter of the portion a is substantially the same as the external diameter of the extension 7 of member 3; consequently, when the packing element is forced on said extension, a tight fit is effected. I prefer to employ means, such for example, as wire 10, for clamping or binding the packing element to the body.

In the form of Fig. 3, the lower section of the casing is formed with an externally threaded portion as in the form of Fig. l, but member 3 in this modified constructionV is formed with external threads 12. In this modified form, I employ a coupling 13, the latter having internal threads 11 designed to respectively engage the exterior threads of the lower section 1 and member 3. This last mentioned form is otherwise similar to the construction of Fig. l.

What I claim is:

l. A well seal including a coupling member threaded at its upper end and adapted to be connected with a casing section, said coupling member having anextension threaded at its lower end, a compressible packing member surrounding the threads on said extension, and projecting below the end of said extension, means for binding the compressible member to the extension, and a shoulder above the threaded extension and with which the top of said packing member contacts.

2. A well seal including a coupling member threaded at its upper end for engage-V ment with a casing section, said member formed with a shoulder and a threaded extension beyond the shoulder, a compressible member surrounding the extension and having the top thereof engaging said shoulder, and means for binding the compressible member to the threaded extension.

3. A well seal including a coupling body' member adapted for engagement with a pipe section, said body formed with a squared shoulder and a reduced extension at vits lower end, and a compressible member surrounding the extension, having a shoulder in contact with the lower end of the extension and having the top thereof in contact with said shoulder.

4. A well seal including a coupling member adapted for engagement with a casing section, said member formed with a reduced extension Vancl a shoulder, a, compressble vIn testimony whereof I aHX mysgnature packing member surrounding the extension in presence of two Witnesses.

and bearing on said shoulder, said-packing member having an internal shoulder in contact Wit-h the lower end of the extension, andi means ffor binding ythe oomfpressibl'e' member to the extension.

.j PATRICK H. MACK.

l Witnesses: e

' W. E. BURDICK RALPH WHEELER. 

